Question: What is the astronomical filter for Messier 7 has apparent magnitude as 3.3?
Paraphrase: What is the galactic channel for Messier 7 has clear greatness as 3.3?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q11234 p:P1215 ?s . ?s ps:P1215 ?x filter(contains(?x , '3.3')) . ?s pq:P1227 ?value}